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Gas Bubble Trauma at Lower Snake River Dams Data from the Fish Passage Center Little Goose and Lower Monumental Dams, June-July 2007

Observation of Gas Bubble Trauma
at Little Goose Dam in 2007

	Yearling Chinook		Steelhead		Subyearling Chinook		All Species	% Total Dissolved Gas
Date	# Exam	% GBT	# Exam	% GBT	# Exam	% GBT	% GBT	Little Goose Forebay	Lower Granite Tailrace
June 5	6	0%	94	15%	0	N/A	14%	112.8%	112.9%
June 8	2	0.5%	92	39%	6	0%	37%	108.2%	112.2%
June 10	0	N/A	50	26%	100	3%	11%	110.9%	113.6%
June 12	2	0%	50	22%	98	5%	11%	109.3%	111.8%
June 19	2	0%	61	56%	14	7%	46%	109.6%	115.7%
June 26	1	0%	2	50%	99	3%	4%	109.3%	114.8%
July 3	3	0%	4	25%	97	2%	3%	110.3%	113.6%
July 10	0	N/A	12	67%	90	6%	13%	109.2%	113.6%
July 24	0	N/A	82	28%	16	0%	24%	107.5%	111%

Observation of Gas Bubble Trauma
at Lower Monumental Dam in 2007

	Yearling Chinook		Steelhead		Subyearling Chinook		All Species	% Total Dissolved Gas
Date	# Exam	% GBT	# Exam	% GBT	# Exam	% GBT	% GBT	Lower Monumental Forebay	Little Goose Tailrace
June 4	2	0%	64	19%	0	N/A	18%	114.3%	113.8%
June 7	4	0%	18	28%	0	N/A	23%	109.0%	112.2%
June 11	3	33%	33	49%	5	0%	42%	110.2%	109.4%
June 25	0	N/A	1	0%	0	N/A	0%	106.9%	108.3%
July 1	0	N/A	2	50%	23	0%	4%	107.0%	107.8%
July 8	0	N/A	1	100%	3	0%	25%	107.6%	109.3%
July 22	0	N/A	3	0%	3	0%	0%	105.0%	107.6%
July 29	0	N/A	5	40%	3	0%	25%	106.3%	107.9%